B737-400 crew had track deviation to avoid thunderstorms in ZNY oceanic class a airspace.

Attributes
ACN	491050
Time
Date	200011
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	intersection : lacki
State Reference	FO
Altitude	msl single value : 27000
Environment
Flight Conditions	IMC
Weather Elements	Thunderstorm
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute : other oceanic enroute airway : a300.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 18000 flight time type : 5000
ASRS Report	491050
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	inflight encounter : weather non adherence : clearance other spatial deviation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	other
Supplementary
Problem Areas	Airspace Structure ATC Human Performance Weather
Primary Problem	ATC Human Performance

Narrative:

Deviated 5 mi further west of course, ie, 20 mi west instead of 15 mi west for operational concerns. Major area of WX in vicinity of lacki on A300 phl to sju. This was due to extremely slow response of the ATC oceanic system.

Original NASA ASRS Text

Title: B737-400 CREW HAD TRACK DEV TO AVOID TSTMS IN ZNY OCEANIC CLASS A AIRSPACE.

Narrative: DEVIATED 5 MI FURTHER W OF COURSE, IE, 20 MI W INSTEAD OF 15 MI W FOR OPERATIONAL CONCERNS. MAJOR AREA OF WX IN VICINITY OF LACKI ON A300 PHL TO SJU. THIS WAS DUE TO EXTREMELY SLOW RESPONSE OF THE ATC OCEANIC SYS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.